28767632077 has 4 divisors (see below), whose sum is σ = 29759619420. Its totient is φ = 27775644736.

The previous prime is 28767632051. The next prime is 28767632093. The reversal of 28767632077 is 77023676782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11181159081 + 17586472996 = 105741^2 + 132614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28767632077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28767672077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495993628 + ... + 495993685.

It is an arithmetic number, because the mean of its divisors is an integer number (7439904855).

Almost surely, 2^28767632077 is an apocalyptic number.

It is an amenable number.

28767632077 is a deficient number, since it is larger than the sum of its proper divisors (991987343).

28767632077 is an equidigital number, since it uses as much as digits as its factorization.

28767632077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991987342.

The product of its (nonzero) digits is 8297856, while the sum is 55.

The spelling of 28767632077 in words is "twenty-eight billion, seven hundred sixty-seven million, six hundred thirty-two thousand, seventy-seven".